Swift Foxes and Ideal Free Distribution: Relative Influence of Vegetation and Rodent Prey Base on Swift Fox Survival, Density, and Home Range Size

Table 3

The Pearson correlation coefficients for swift fox prey base and vegetation structure variables on 185 sampling grids in southeastern Colorado, 2001–2004.Capture rates indicate the total number of individuals captured for selected species.Total captures, biomass, and community indices include all species.Values exceeding ± 0.34 are significant at the 𝑃=0.05 level.

Prey base variables	Ord’s; kangaroo rat	N.grasshopper; mouse	Deer mouse	Total captures	Per capita; biomass	Richness	Diversity	SD; richness	SD; diversity
Ord's kangaroo rat	—	0.26	0.46	0.57	0.53	0.55	0.62	0.55	0.73
N.grasshopper mouse		—	0.18	0.50	0.37	0.50	0.30	0.48	−0.18
Deer mouse			—	0.46	0.32	0.44	0.50	0.53	0.41
Total captures				—	0.59	0.99	0.71	0.72	0.48
Per capita biomass					—	0.58	0.41	0.46	0.32
Richness						—	0.83	0.73	0.56
Diversity							—	0.72	0.82
SD richness								—	0.67
SD diversity									—
Vegetation structure variables	% basal area	Mean grass height	Mean shrub height	Shrubs/100 m^2	SD basal area	SD shrub height	SD shrubs/100 m^2
% basal cover	—	0.43	0.46	0.30	0.11	0.41	0.23
Mean grass height		—	0.76	0.39	0.31	0.20	0.20
Mean shrub height			—	0.65	0.26	0.88	0.52
Shrubs/100 m^2				—	0.06	0.39	0.90
SD basal area					—	0.26	0.15
SD shrub height						—	0.35
SD shrubs/100 m^2							—